I have a dimension 4550 w/512 mb  It says I have 88.8 gb of free space. 

I have done the defragmenting, virus scan, disc scan, emptied my recycle bin, cleared foot prints,

deleted temporary files, and cleared cookies.

On line and off line it will just freeze.  It can stay frozen for 1 minute to 5 or more.  Oh and I have rebooted several times. 

 

Any ideas?